diff --git a/Application/Admin/Controller/PromoteCompanyController.class.php b/Application/Admin/Controller/PromoteCompanyController.class.php
index 5524c3c17..95d5c6488 100644
--- a/Application/Admin/Controller/PromoteCompanyController.class.php
+++ b/Application/Admin/Controller/PromoteCompanyController.class.php
@@ -1156,6 +1156,12 @@ class PromoteCompanyController extends ThinkController
             if ($save['site_domain_prefix'] == '') {
                 $this->error('请输入推广后台域名前缀');
             }
+            if (strlen($save['site_domain_prefix']) > 6) {
+                $this->error('域名前缀不能超过6个字符');
+            }
+            if (!preg_match('/^[a-z0-9]+$/', $save['site_domain_prefix'])) {
+                $this->error('域名前缀只能由小写字母和数字组成');
+            }
             if ($save['site_config']['icon'] == '') {
                 $this->error('请上传推广后台ICON');
             }
diff --git a/Application/Admin/View/PromoteCompany/add.html b/Application/Admin/View/PromoteCompany/add.html
index 02c90526a..670ef62f9 100644
--- a/Application/Admin/View/PromoteCompany/add.html
+++ b/Application/Admin/View/PromoteCompany/add.html
@@ -378,7 +378,7 @@
                             <td class="l"><i class="mustmark" style="margin-left:-7px">*</i>推广后台域名前缀：</td>
                             <td class="r" >
                                 <input type="text" class="txt" style="float: none;" name="site_domain_prefix" value="" placeholder="请输入推广后台域名前缀">
-                                <span class="notice-text" style="float: none;">请确保唯一。完整地址： <span id="site-url-show" style="color: red; font-weight: bold;" data-domain="<?=C('DOMAIN', null, null)?>">无</span></span>
+                                <span class="notice-text" style="float: none;">请确保唯一，只能由小写字母和数字组成，不能超过6个字符。完整地址： <span id="site-url-show" style="color: red; font-weight: bold;" data-domain="<?=C('DOMAIN', null, null)?>">无</span></span>
                             </td>
                         </tr>
 
diff --git a/Application/Admin/View/PromoteCompany/edit.html b/Application/Admin/View/PromoteCompany/edit.html
index 14b45c62c..aa92e9a7f 100644
--- a/Application/Admin/View/PromoteCompany/edit.html
+++ b/Application/Admin/View/PromoteCompany/edit.html
@@ -387,7 +387,7 @@
                                     }
                                 ?>
                                 <input type="text" class="txt" style="float: none;" name="site_domain_prefix" value="{$data.site_domain_prefix}" placeholder="请输入推广后台域名前缀">
-                                <span class="notice-text" style="float: none;">请确保唯一。完整地址： <span id="site-url-show" style="color: red; font-weight: bold;" data-domain="<?=$domain?>"><?=$siteUrl?></span></span>
+                                <span class="notice-text" style="float: none;">请确保唯一，只能由小写字母和数字组成，不能超过6个字符。完整地址： <span id="site-url-show" style="color: red; font-weight: bold;" data-domain="<?=$domain?>"><?=$siteUrl?></span></span>
                             </td>
                         </tr>